QTableWidget设置表头筛选（含鼠标点击事件过滤）

QtableWidget设置表头点击事件，显示筛选框，实现类似excel的表头筛选功能；
通过重写eventFilter事件过滤方法，获取鼠标点击的事件（含点击表格的空白处）

效果图

Widget.h

#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>
#include <QTableWidget>
#include <QToolButton>
#include <QTableWidget>
#include <QTableWidgetItem>
#include <QEvent>#include "FilterWidget.h"
class Widget : public QWidget
{Q_OBJECTpublic:Widget(QWidget *parent = 0);~Widget();//初始化void Init();//插入测试数据void InsertDatas();//筛选void filter(int col, QStringList showList);//关闭筛选框void closeFilterWidget();//事件过滤bool eventFilter(QObject *obj, QEvent *e);//初始化mapvoid initMap();private slots://表头点击槽函数void onHeaderClicked(int);private:QTableWidget *m_tableWidget = nullptr;//筛选框FilterWidget* m_filterWidget = nullptr;//列号，显示的元素QMap<int, QStringList> m_map;};#endif // WIDGET_H

Widget.cpp

#include "widget.h"
#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QHeaderView>
#include <QRadioButton>
#include <QMessageBox>
#include <QSet>
#include <QMouseEvent>#pragma execution_character_set("utf-8")Widget::Widget(QWidget *parent): QWidget(parent)
{//初始化Init();//插入测试数据InsertDatas();QVBoxLayout* lay = new QVBoxLayout(this);lay->setMargin(0);lay->setSpacing(0);setLayout(lay);lay->addWidget(m_tableWidget);//注册事件过滤m_tableWidget->viewport()->installEventFilter(this);
}Widget::~Widget()
{if (m_filterWidget != nullptr){delete m_filterWidget;m_filterWidget = nullptr;}
}//初始化表格
void Widget::Init()
{m_tableWidget = new QTableWidget(this);//表头字体居中m_tableWidget->horizontalHeader()->setDefaultAlignment(Qt::AlignHCenter);//自适应宽度m_tableWidget->horizontalHeader()->setSectionResizeMode(QHeaderView::Interactive);//使行列头自适应宽度，最后一列将会填充空白部分m_tableWidget->horizontalHeader()->setStretchLastSection(true);//设置行选中m_tableWidget->setSelectionBehavior(QAbstractItemView::SelectRows);//选中多行，可以使用shift，ctrl//SingleSelection-单选//MultiSelection-多选//ExtendedSelection-支持shift，ctrl和Ctr+A操作m_tableWidget->setSelectionMode(QAbstractItemView::SingleSelection);//禁止编辑m_tableWidget->setEditTriggers(QAbstractItemView::NoEditTriggers);//隐藏垂直表头//m_tableWidget->verticalHeader()->hide();m_tableWidget->setColumnWidth(0, 150);m_tableWidget->setColumnWidth(1, 80);m_tableWidget->setColumnWidth(2, 80);m_tableWidget->setColumnWidth(3, 250);m_tableWidget->setColumnWidth(4, 50);QStringList headerLabels;headerLabels << QString("列1") << QString("列2") << QString("列3") << QString("列4") << QString("列5");m_tableWidget->setColumnCount(headerLabels.size());m_tableWidget->setHorizontalHeaderLabels(headerLabels);//表头点击connect(m_tableWidget->horizontalHeader(), SIGNAL(sectionClicked(int)),this, SLOT(onHeaderClicked(int)));
}//插入测试数据
void Widget::InsertDatas()
{for (int i = 0; i < 2; i++){int row = m_tableWidget->rowCount();m_tableWidget->insertRow(row);m_tableWidget->setItem(row, 0, new QTableWidgetItem(QString("1")));m_tableWidget->setItem(row, 1, new QTableWidgetItem(QString("1")));m_tableWidget->setItem(row, 2, new QTableWidgetItem(QString("1")));m_tableWidget->setItem(row, 3, new QTableWidgetItem(QString("1")));m_tableWidget->setItem(row, 4, new QTableWidgetItem(QString("1")));}for (int i = 0; i < 2; i++){int row = m_tableWidget->rowCount();m_tableWidget->insertRow(row);m_tableWidget->setItem(row, 0, new QTableWidgetItem(QString("2")));m_tableWidget->setItem(row, 1, new QTableWidgetItem(QString("2")));m_tableWidget->setItem(row, 2, new QTableWidgetItem(QString("2")));m_tableWidget->setItem(row, 3, new QTableWidgetItem(QString("2")));m_tableWidget->setItem(row, 4, new QTableWidgetItem(QString("2")));}for (int i = 0; i < 2; i++){int row = m_tableWidget->rowCount();m_tableWidget->insertRow(row);m_tableWidget->setItem(row, 0, new QTableWidgetItem(QString("1")));m_tableWidget->setItem(row, 1, new QTableWidgetItem(QString("3")));m_tableWidget->setItem(row, 2, new QTableWidgetItem(QString("3")));m_tableWidget->setItem(row, 3, new QTableWidgetItem(QString("3")));m_tableWidget->setItem(row, 4, new QTableWidgetItem(QString("2")));}//初始化mapinitMap();
}//初始化map
void Widget::initMap()
{for (int col = 0; col < m_tableWidget->columnCount(); col++){QStringList strList;for (int row = 0; row < m_tableWidget->rowCount(); row++){QString   strItem = m_tableWidget->item(row, col)->text();strList.append(strItem);}m_map[col] = strList;}
}//筛选
void Widget::filter(int col, QStringList showList)
{m_map[col] = showList;for (int i = 0; i < m_tableWidget->rowCount(); i++){bool hidden = false;//遍历mapfor each (int  v_col in m_map.keys()){QString strItem = m_tableWidget->item(i, v_col)->text();if (!m_map.value(v_col).contains(strItem)){hidden = true;break;}}m_tableWidget->setRowHidden(i, hidden);}
}//表头点击槽函数
void Widget::onHeaderClicked(int col)
{//所有itemQSet<QString> items;//显示的itemQSet<QString> showItems;//行数int rows = m_tableWidget->rowCount();//遍历列表for (int i = 0; i < rows; i++){QString strItem = m_tableWidget->item(i, col)->text();items.insert(strItem);if (m_map.value(col).contains(strItem)){showItems.insert(strItem);}}//转为QStringListQStringList strItems;QStringList strShowItems;for each (QString var in items){strItems.append(var);}for each (QString var in showItems){strShowItems.append(var);}//关闭筛选框closeFilterWidget();//新建筛选框m_filterWidget = new FilterWidget(strItems, strShowItems, col, m_tableWidget);m_filterWidget->exec(m_tableWidget->mapFromGlobal(cursor().pos()));
}//事件过滤
bool Widget::eventFilter(QObject *target, QEvent *event)
{QMouseEvent *e = static_cast<QMouseEvent *>(event);if (e == nullptr){return QWidget::eventFilter(target, event);}if (e->type() == QEvent::MouseButtonPress || e->type() == QEvent::MouseButtonRelease){closeFilterWidget();}return QWidget::eventFilter(target, event);
}//关闭筛选框
void Widget::closeFilterWidget()
{//清空筛选框if (m_filterWidget != nullptr){QStringList showList = m_filterWidget->getShowList();filter(m_filterWidget->getColumn(), showList);delete m_filterWidget;m_filterWidget = nullptr;}
}

FilterWidget.h

#pragma once
#include <QWidget>
#include <QListWidget>
#include <QListWidgetItem>
#include <QList>
#include <QCheckBox>
#include <QSet>class FilterWidget :public QWidget
{public:FilterWidget(QStringList Items, QStringList showItems, int col, QWidget *parent = 0);~FilterWidget();//获取要显示的列表QStringList getShowList();//获取列号int getColumn();//显示void exec(const QPoint &pos);private slots://勾选状态更改void slot_stateChanged();private:QListWidget* m_ListWidget = nullptr;//要显示的项QStringList m_showList;//列号int m_col;
};

FilterWidget.cpp

#include "FilterWidget.h"#include <QVBoxLayout>
#include <QEventLoop>//Items：所有项
//showItems：显示的项
//col：列号
FilterWidget::FilterWidget(QStringList Items, QStringList showItems, int col, QWidget *parent/*=0*/):QWidget(parent),m_col(col)
{this->setFixedWidth(50);this->setFixedHeight(100);m_ListWidget = new QListWidget(this);QVBoxLayout* lay = new QVBoxLayout(this);lay->setMargin(0);lay->setSpacing(0);setLayout(lay);for each (QString var in Items){QCheckBox* checkBox = new QCheckBox(this);checkBox->setText(var);if (showItems.contains(var)){m_showList.append(var);checkBox->setChecked(true);}connect(checkBox, &QCheckBox::stateChanged, this, &FilterWidget::slot_stateChanged);QListWidgetItem *item = new QListWidgetItem();m_ListWidget->addItem(item);m_ListWidget->setItemWidget(item,checkBox);}lay->addWidget(m_ListWidget);}FilterWidget::~FilterWidget()
{}QStringList FilterWidget::getShowList()
{return m_showList;
}int FilterWidget::getColumn()
{return m_col;
}void FilterWidget::exec(const QPoint & pos)
{setAttribute(Qt::WA_ShowModal, true);move(pos);show();QRect rect = geometry();QEventLoop loop;loop.exec();
}void FilterWidget::slot_stateChanged()
{m_showList.clear();//遍历for (int i = 0; i < m_ListWidget->count(); i++){//先获取QListWidgetItemQListWidgetItem *item = m_ListWidget->item(i);//找到第i个Item对应的CheckBoxQCheckBox *checkBox = static_cast<QCheckBox *>(m_ListWidget->itemWidget(item));if (checkBox->isChecked())m_showList.append(checkBox->text());}
}

示例工程

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QTableWidget设置表头筛选（含鼠标点击事件过滤）

效果图

Widget.h

Widget.cpp

FilterWidget.h

FilterWidget.cpp

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